Question

Calcule o valor de X nas proporções:

a) X/9 = 10/30

b) 8/X = 2/8

Answer 1

a)X/9=10/30
X/9=1/3
3X=9
X=9/3
X=3


b)8/X=2/8
8/X=1/4
X=8.4
X=32

Answer 2

Explicação passo-a-passo:

a)

$\sf \dfrac{x}{9} = \dfrac{10}{30}$

$\sf x * 30 = 9 * 10$

$\sf 30x = 90$

$\sf x = \dfrac{90}{30}$

$\red{\sf x = 3}$

b)

$\sf \dfrac{8}{x} = \dfrac{2}{8}$

$\sf x * 2 = 8 * 8$

$\sf 2x = 64$

$\sf x = \dfrac{64}{2}$

$\red{\sf x = 32}$